Absolute dimensions of eclipsing binaries. XI. V451 Ophiuchi.
Abstract
V451 Oph is a detached eclipsing binary with B9 - A0 main sequence components in a slightly eccentric orbit, and this paper presents accurate absolute dimensions for the system: masses 2.78±0.06 and 2.36±0.05 M_sun;; radii 2.64±0.03 and 2.03±0.05 R_sun;; effective temperatures 10800±800 and 9800±500K. An orbital eccentricity e = 0.0125±0.0015 is obtained and the period of periastron revolution is 180±30 yr. The orbital inclination is 85°.9±0°.5, the relative radii are 0.2155±0.0020 and 0.1655±0.0020, respectively, and secondary eclipse is close to being total. The luminosity ratio between the components is found to be 0.489±0.015 (y), slightly lower than the spectroscopic result 0.60±0.05, which cannot be reproduced from the available photometric information. The components are well-represented by the theoretical evolutionary models by Hejlesen (1980) for an initial chemical composition of (X, Z) = (0.70, 0.02) and a common age of 2×108yr.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 1986
- Bibcode:
- 1986A&A...167..287C
- Keywords:
-
- Eclipsing Binary Stars;
- Stellar Mass;
- Stellar Orbits;
- Stellar Temperature;
- A Stars;
- Apsides;
- Astronomical Photometry;
- Astronomical Spectroscopy;
- B Stars;
- Astrophysics;
- Eclipsing Binaries:Ages;
- Eclipsing Binaries:Effective Temperatures;
- Eclipsing Binaries:Photometric Elements;
- Eclipsing Binaries:Stellar Evolution;
- Eclipsing Binaries:Stellar Structure;
- Effective Temperatures:Eclipsing Binaries;
- Photometric Elements:Eclipsing Binaries;
- Stellar Evolution:Eclipsing Binaries;
- Stellar Structure:Eclipsing Binaries